Ohh I know jumps in platformers are hard, I don't have experience in platformers. So think in the idea of: you arent making a normal human jumping, so crash some phisic rules... (is more something emotional to say). Ey man to reach the theme the only one thing needed is... decoration, assets that looks all vampiric!
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Okay, I did try to look for some assets for the jam but they were clashing all over and was spending hours looking for an ideal asset so I gave up and went with my own assets for consistency. But next time I could make some stick vampire assets.
Jumps are hell. I have physics sensitive friends that always tell me the jump is off but I am getting better and better.